7 1.1 Genes as determinants of the inherent properties of species Key Protein-coding region of DNA Protein-coding region of RNA Noncoding region Noncoding region Promoter RNA polymerase Regulatory proteins Secreted protein Proteins used in cell Amino acid chain Ribosome Protein encoded by mitochondrion or chloroplast Gene 1 Nuclear chromosomes Gene 2 Gene 3 Gene 4 Circular organelle chromosome Mitochondrion or chloroplast Internal signal External signal Cell membrane Intron removal mRNA 1 mRNA 2 mRNA 3 mRNA 4 Nuclear membrane Endoplasmic reticulum Golgi apparatus Figure 1-9 Simplifed view oF gene action in a eukaryotic cell. The basic Fow of genetic information is from DNA to RNA to protein. ±our types of genes are shown. Gene 1 responds to external regulatory signals and makes a protein for export; gene 2 responds to internal signals and makes a protein for use in the cytoplasm; gene 3 makes a protein to be transported into an organelle; gene 4 is part of the organelle DNA and makes a protein for use inside its own organelle. Most eukaryotic genes contain introns, regions (generally
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '10 term at McMaster University.